doc: Adding the Design document for PIM IPv6

Added the High Level design for implementing MLD and PIMv6.

Added a PPT as well in case someone wants to translate it
to some other language.

Signed-off-by: Mobashshera Rasool <mrasool@vmware.com>

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diff --git a/doc/developer/PIMv6-Design.pptx b/doc/developer/PIMv6-Design.pptx
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